Chapter 10
Which of the following individuals would have more mitochondria in her skeletal muscle?
A 22-year-old soccer player
tentanus muscles is described as
Action potential frequency is high enough that no relaxation of muscle fibers occurs
A lack of mitochondria within a skeletal muscle fibers would impair, which ATP yielding chemical process?
aerobic respiration
When someone says to turn that frown upside down, they mean to relax your and contract your
Depressor annuli Oris lavator anguli oris
Which of the following events occurs during the lag phase of muscle twitch
The action potential is propagated from presynaptic to postsynaptic membrane.
In order for muscle relaxation to occur,
The active sites on an actin muscle must be blocked
The insertion is
The end of the muscle were the action occurs
A concentric contraction is described as
the muscle produces increasing tension as it shortens.
Excitation contraction coupling begins with?
the production of an action potential in the sarcolemma
Channels that open or close in response to changes in the electrical charge or voltage across the plasma membrane are called?
voltage-gated ion channels
Which of the following muscles of the chest has its insertion of the humerus
pectoralis major
The rectus femoris is an example of which muscle shape
pennate
Which of the following is a posterior thigh muscle?
biceps femoris
Which type of muscle tissue would cause flexion, and extension of the arm?
skeletal muscle
The model that describes the contraction of the muscle is called the
sliding filament model
Which type of muscle tissue has spindle shaped cells
smooth muscle
The bulge of the calf is caused by the ____ & ____ muscles.
gastrocnemius and soleus
The biceps femoris is part of the
hamstring muscles
Which of the following muscles is involved in chewing gum?
masseter
The H zone
Contains only myosin myofilaments
Some people suffer, involuntary urination due to incompetence of which muscle
External urethral sphincter
The terrace major and teres minor are not involved in
Flexion and adduction of the arm
The radial pulse can be felt just lateral to the tendon of the
Flexor carpi radialis
The adductor longus is named for its
Function and size
Which time muscle adducts the thigh, and flexes the knee
Graciilis
Troponin
Has a calcium binding site
Which of the following represents a class one lever system?
Hyper extension of the head
Smooth muscle and cardiac muscle are familiar in that they both
Are under involuntary control are striated have multiple nuclei
Of the following muscles of the forearm, which one rotates the forearm to turn the palm upwards?
Brachialis
Identify the statements concerning skeletal muscle that is true
It is responsible for locomotion
Infraspinatus
Laterally rotates the arm
Movement of the body are usually smooth and occur at differing rates because
Motor units contract out of phase at their own particular rates
Of the following muscles of the thigh, which one does not pull those like forward?
Rectus femoris
The abdominal muscles that has its origin at the public crust and symphysis pubis is the
Rectus, abdominis
In order to stabilize the hyoid so that the larynx can be elevated in swallowing, the __________ muscle group is used
Supra hyoid
Epimysium
Surrounds individual muscles
Which of the following is true concerning isotonic concentration contraction?
The muscle shortens, but tension remains constant
Whole muscles can respond in a graded fashion to stimuli by varying
The number of motor units recruited
Callie is a world class marathon runner. Which of the descriptions about her dominant type of skeletal muscle is FALSE?
They are well adapted to anaerobic activity.
Which of the following statements concerning fast twitch muscle fiber is true
They split ATP rapidly
Which of the following muscles is named for its shape
Trapezius
Which of the following muscles move the scapular
Trapezius
The orbicularis oculi muscle
causes crow's feet wrinkles
Lack of acetylcholinesterase in the synaptic cleft would result in
continuous stimulation of the postsynaptic membrane
The Zygomaticus major muscle
contributes to laughing and smiling.
Contraction of the inferior rectus muscle directs the pupil to look?
down
Acetylcholine is released from the presynaptic terminal by the process of?
exocytosis
The length of the resting sarcomere is
longer than the length of a contracted sarcomere.
Contracting the right sternocleidomastoid muscle would
rotate the head toward the left.
Maureen is hiking in the cold and to maintain homeostasis. Her body begins to.
to shiver